const num = new Number(99);
console.log(num.valueOf());

const string = new String("后盾人");
console.log(string.valueOf());

const boolean = new Boolean(true);
console.log(boolean.valueOf());

const date = new Date();
console.log(date.valueOf());

const regexp = new RegExp("\\d+");
console.log(regexp.test(99));
console.log(regexp.toString(), regexp.valueOf());
console.log(typeof regexp.toString(), typeof regexp.valueOf());

let hd = new Object();
hd.name = "后盾人";
console.log(hd);